03 yukon 80psi oil to 0psi under heavy throttle

[chevyv8]

hello gents!
2003 Yukon 4wd 5.3l 164,000 miles
oil pressure guage reads 80psi at all times. under heavy throttle gauge goes to zero with a warning chime. let off throttle and gauge goes back to 80psi

any thoughts?

 

[BG1988]

hello gents!
2003 Yukon 4wd 5.3l 164,000 miles
oil pressure guage reads 80psi at all times. under heavy throttle gauge goes to zero with a warning chime. let off throttle and gauge goes back to 80psi

any thoughts?

new oil sensor replace the oring as well

 

[chevyv8]

fixed. thank you
took less than 10 minutes and installed new sending unit. all is good now with oil presure